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Cisco ASA 5500 Series Configuration Guide using ASDM
OL-20339-01
Chapter 47 Configuring Cisco Intercompany Media Engine Proxy
Guidelines and Limitations
For more information about licensing, see Chapter 4, “Managing Feature Licenses.”
Guidelines and Limitations
Context Mode Guidelines
Supported in single context mode only.
Firewall Mode Guidelines
Supported in routed firewall mode only.
IPv6 Guidelines
Does not support IPv6 addresses.
Additional Guidelines and Limitations
Cisco Intercompany Media Engine has the following limitations:
• Fax is not supported. Fax capability needs to be disabled on the SIP trunk.
• Stateful failover of Cisco Unified Intercompany Media Engine is not supported. During failover,
existing calls traversing the Cisco Intercompany Media Engine Proxy disconnect; however, new
calls successfully traverse the proxy after the failover completes.
Model License Requirement
All models Intercompany Media Engine license.
When you enable the Intercompany Media Engine (IME) license, you can use TLS proxy sessions up
to the platform limit. If you also install the Unified Communications (UC) license, then the sessions
available for UC are also available for IME sessions. For example, if the platform limit is 1000 TLS
proxy sessions, and you purchase a 750-session UC license, then the first 250 IME sessions do not
affect the sessions available for UC. If you need more than 250 sessions for IME, then the remaining
750 sessions of the platform limit are used on a first-come, first-served basis by UC and IME.
The maximum number of IME sessions you can use depends on the TLS proxy session limit:
• For a license part number ending in “K8”, TLS proxy sessions are limited to 1000.
Note For a license part number ending in “K9”, the TLS proxy limit depends on your configuration
and the platform model. To configure the TLS proxy limit, use the Configuration > Firewall >
Unified Communications > TLS Proxy pane.K8 and K9 refer to whether the license is
restricted for export: K8 is unrestricted, and K9 is restricted.
You might also use SRTP encryption sessions for your connections:
• For a K8 license, SRTP sessions are limited to 250.
• For a K9 license, there is not limit.
Note Only calls that require encryption/decryption for media are counted towards the SRTP limit;
if passthrough is set for the call, even if both legs are SRTP, they do not count towards the limit.
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